Superman: Unbound sounds like it has potential. The storyline was decent and an animated version might add to it. Flashpoint, however, why? That was a very disappointing mini-series, and epitomized the problems DC had prior to the New-52 (the problems DC had after the New-52 is a different topic ).

If you get rid of the general plot and just focused on the world went wrong angle and throwing the spotlight on a Justice League of very different personalities (Thomas Wayne, Cyborg and a very different Marvel against evil WW and Aquaman), it would certainly be a more serviceable story.